I would suggest the Sky90, FSQ106ED and ε-180ED users to make their measurements and agree on the design, before the actual production. Or a prototype for each type to be built before the massive production.

The measure I did, was use a 卡尺 to measure the inside diameter of the dew shield.

I think Angus did make a point, if the mask is made too fit, it may scratch the paint inside the dew shield. If the mask is made by fixing outside the dew shield like those branded one, that worry may be reduced.

Another suggestion on the slots is, the slots should be made a bit longer than the objective diameter, so that the whole lens surface is covered, instead of some masks that just cover part of the objective. Please note the outer part of the objective do collect most lights which affect the focus the most.

I don't have a long enough 卡尺 to measure for ε-180ED, may be we need Angus' help to provide the measurement and suggestion.

I would suggest the Sky90, FSQ106ED and ε-180ED users to make their measurements and agree on the design, before the actual production. Or a prototype for each type to be built before the massive production.

The measure I did, was use a 卡尺 to measure the inside diameter of the dew shield.

I think Angus did make a point, if the mask is made too fit, it may scratch the paint inside the dew shield. If the mask is made by fixing outside the dew shield like those branded one, that worry may be reduced.

Another suggestion on the slots is, the slots should be made a bit longer than the objective diameter, so that the whole lens surface is covered, instead of some masks that just cover part of the objective. Please note the outer part of the objective do collect most lights which affect the focus the most.

I don't have a long enough 卡尺 to measure for ε-180ED, may be we need Angus' help to provide the measurement and suggestion.

望远镜的品牌和型号: 高橋FSQ106ED
望远镜物镜直径: 106mm
望远镜的焦距: 530mm
望远镜的遮光罩内径: 145mm

望远镜的品牌和型号: 高橋Sky90
望远镜物镜直径: 90mm
望远镜的焦距: 407mm
望远镜的遮光罩内径: 110mm

Other common scopes: C8 & M8.

Total Agree.

Please every one give the detail information.
Then we check together, and get the final confirmation dimension.
For the prototype, I think we can make it, if there is more than 2 pcs. However, some of them only one pcs. That will be no chance.
Subaru, if you have some the other design, I can ask Vixen to quote for you. However, please remember that he use the PMMA 2.5mm sheet to make it. You can not expect to make it as like as a telescope cover - 3D product. Anyway, if you have any design, please feel free to send me, then we can discuss together.

I think the preferred design is to:
1) cut the mask with extra rim ~5mm, therefore making mask diameter ~10mm larger than outer diameter of dew shield
2) cut a ring with inner diameter ~0.5mm larger than outer diameter of dew shield
3) glue the above ring onto the mask so that we can just place the mask over the dew shield

I know this design may be slightly more expansive to make compared to the original design, but it should be a bit safer. funoooo, can you please see if the supplier can also quote a price for this design? Then people can decide which design and order accordingly.

Please note that my measurements for FSQ-106ED is different from that of Subaru for some reason. Subaru, can you please double check your measurements? Thanks!

Subaru 寫:Thanks funoooo for arranging this service for us.

I would suggest the Sky90, FSQ106ED and ε-180ED users to make their measurements and agree on the design, before the actual production. Or a prototype for each type to be built before the massive production.

The measure I did, was use a 卡尺 to measure the inside diameter of the dew shield.

I think Angus did make a point, if the mask is made too fit, it may scratch the paint inside the dew shield. If the mask is made by fixing outside the dew shield like those branded one, that worry may be reduced.

Another suggestion on the slots is, the slots should be made a bit longer than the objective diameter, so that the whole lens surface is covered, instead of some masks that just cover part of the objective. Please note the outer part of the objective do collect most lights which affect the focus the most.

I don't have a long enough 卡尺 to measure for ε-180ED, may be we need Angus' help to provide the measurement and suggestion.

I think it doesn't really matter that much. From what I understand, the patterns will have narrrower slits if focal length used is shorter and vice versa. Narrower slits will produce larger diffraction crosses while wider slits will produce smaller diffraction crosses. Both are usable so long as it is not vastly off. The only difference is that if your diffraction cross is too large or too small, it may be more difficult to judge the at focus point.

For the prototype, I think we can make it, if there is more than 2 pcs. However, some of them only one pcs. That will be no chance.
Subaru, if you have some the other design, I can ask Vixen to quote for you. However, please remember that he use the PMMA 2.5mm sheet to make it. You can not expect to make it as like as a telescope cover - 3D product. Anyway, if you have any design, please feel free to send me, then we can discuss together.

I don't think I need a thick cup (5mm high) as mentioned in Vixen's response. He can just use 2.5mm thick PMMA to make the ring. That should be sufficient. Or, alternatively, just make the ring in soft materials such as soft plastic or even foam and glue it to be mask. I believe that will be sufficient too.

Otherwise, just make the mask, allow for the extra rim. We can DIY and stick 3-4 small blocks of thick foams along the rim. That should be fine too. In fact, if making the ring is difficult, that would be my preferred option. That is, just make the mask with outer diameter = outer diameter of the dew shield + 20mm. Forget about the 4 little circles. I'll take care of the blocks to hold the mask onto the dew shield.

I don't mind to be a guiene pig for this design. Just make one for each of my scopes. I'll report back on their performance after I have a chance to use them.